Full text access to journals and other scholarly materials focusing on the fields of organismal and integrative biology, ecology, and environmental science.
The Cochrane Collection provides access to articles about experiments in medicine, as well as bibliographies of clinical trials, reports from conference proceedings, and abstracts of reviews on health care from around the world.
Entrez is NCBI’s primary text search and retrieval system that integrates the PubMed database of biomedical literature with 39 other literature and molecular databases including DNA and protein sequence, structure, gene, genome, genetic variation and gene expression.
Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines.